Centrifugal pump.



`KROGH. GBNTRIPUGAL' PUMP.

APPLICATION FILED JUNE 14, 1905.

Patented Feb. 1,1910.

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INI/ENTOR omhz..

vl Bv TTRNEY P. w. KROGH.

A GEITTRIFUGAL PUMP. APPLIOATION FILED JUNI'. 14,V 1905.

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vCe-@paxm ATTORNEY Patented Feb. 1, 1910.y

4 SHEETS-SHEET L Br r! o@ C?. C? 'di ATTORNEY T. w. KROGH.

` GBNTRIIUGAL PUMP.

APPLICATION FILED JUNE 14. 1905.

W/TNESSES:

s-UMTEDSTAT FERDINAND w.' xRoGH, or 4sAN- FRaNeIsco, CALIFORNIA.'

Be it known vthat I FnnnINANn W, KnoGI-I a citizen of theAv UnitedStates, residing at No 250G Sutter street, SanlFrancisco,-1n the county'of. San Francisco and State of Calilfornia, have invented certain: newand useful parts from the same.

My invention consists in the peculiar and novel construction of the,lnterlor of pump.

casing'so arranged as to meetthe circumference of impeller, causing, byits deviation from'middle or true runnmg'posit-ion, the

discharged .wateror 'liquid to forcethe im, vpeller to return to itscorrect position, as

' will be furtherdescribed,,andpointed out in the claims. I attain thislobject in the mannerillustrated in accompanying drawings, in which- YFigure 1 is a side elevation of a horizontal type of pump, partlyinfsection'; Fig. 2 is an end elevation 'of the'same; Fig. 3 shows avertlcal .type'o'f the same pumppartly section; Figs. 4, 5, and lG showa partly en- -larged view ofv nnpeller, "1n relation'to pump casing andliow'-`.tl1e discharged vwater or liquid would have its coursepartly:diverted.v

Fig. '7 and Fig. '8 are vp art''i-la'nsand sectionalelevations.respectively showing the curved volutes, 10, in forml oflribs on theoutside of impellcr, 1;-.1l"ig. 9 is'a.part elevation of impeller,1,*showing thesesame volutes or ribs, 10,'iny end viewggFig. 10 and-Fig. 11 are part plan-and' sectional eleva.-

tion, -x'iespectively showing lthe .curved volutes,`l 0;y in'lform 'ofhalf-round grooves on the outside -of impellcr 1; and F.ig. `12 is "a'part lelevation `of 'impeller-showing these same volutes, l0. as'half-round, grooves in end view; Fig. .lftshows an elevation cfalvertical type of the samepump, having a' single impeller .andotherwisecontainmg the same features as Fig. 3.

` Similar numbers refer to Vsimilar parts 'throughout the' several.views.

` Fig. l shows the general construction ofy thehorizontal type ofcentrifugal pump, the

sa impeller l, which is here shown, of the inclosed or hollow type,allowing the water or l v.Specificationo1!Ltterslatent. Patevnted'Feb.1, 1910. AmnicatiqnnieBuinen, 1905. .-seriai No. 265,135..

I liquid pumped to' pass through its hollow or central 'partand'discharge at its periphery or eXtreme circumference', as is usual. Theperiphery or circumference of impeller is asshown reinforced by a ring'or rings 2, 2, preferably. of steel or other durable material, shrunk onor otherwise securely fastened; coincident with this ring or rings 2, 2,the pumpcasing has also ring or rings 3, 3, `'sprung in .and securelyfastened to projecting ribs 4, Il, extending all around the 'interior ofcasing, and forming a running joint with .rings 2, 2. The rings 3, 3,are preferably o fjsame material as' those used on impeller` 1, and-theymight be placed in the position as shown in drawing, which is betteradaptedfor the purpose intended;

these rings might-also have other shapes' than squareg'and should besecurely fastened .tol the'casing with screws or rivets.

It is clear in referring to Fig. l, that as the Water or liquid is drawnin through the suctionelbow, 5, forming part of suction pipe, and theimpeller'isdrawn over toward the ysuction side of pum' although thismovement ispartly arreste by the communi-V eating passages, 6, 6,allowing the suction or vacuum effort to equalize on both sidesofimpeller underneath or inside 'the packing rings, '7, 7, yeti as thisequalizing elfrt is only partial, however, and does vnot preventmtheim-peller 1, moving from" its true and central running position, itis clear', as more fully set forth 1n' views 4, 5 and 6, that the-movement of impeller from its central position will 4cause the'water orliquid, as discharged to be partly Athrown against@ the inner wallsofpump casing, 12, thus forcing theimpeller `over toward its Atrueposition, whereas, simultaneously,- the water or liquid 'which may beinclosed on the other side of impeller will 'be drawn out and pass awaywith the ldischarged water or liquid; thus the discharge action of pumphas a natural equalizing effort on impeller, as well as the suctionaction. A

Referring to Fig. 3 and Fig.'13, inwhich a vertical type' of pump isshown and where the Weight of impeller l, with shaft 8, may be quiteconsiderable and where a. pump of this type is Working as is usualagainst. considerable heads, it is very essential that areliable'equalizing medium sl'iould obtain. Should the impeller V1, withits shaft S. owing to their weight, fall below the central runningposition of sald nnpeller l, it is clearV that the dischargedwaterexerting av kmaterial force andV getting on thereverse lower Sideof said impeller, will cause a materiallifting force seeking to sustainthe weight of moving parts. Y

-In drawlngs, Fig. 3 and F 1g. 13, a half 'ball 9, is shown .at thelower extremity ofv V'driving shaft 8. This' half'ballwill serve as a'support for the weightof impeller with shaft 8,.'etc.,`when atrest, butit- 1s not 1n tended to sustain .the Weight of above parts when running.lThe rim of impeller 1, to-

gether with the corresponding portion of pumpcasing, 12, being'protected4 in the manner shown by rings 2, 2, and 8,3, form a verydurable yinnovation from Wear owing to the gravelly sandy and impurestate .of

'water generally pumped.

Referring to Figs. 7, 8, 9, 10, 11, and 12,

in which the volutes 10,-ribs or half-round `grooves are shownin detail,they will in conjunction with the central volutes, or

` webs of im eller 1, form a very potent factor in thebe ore explainedbalancing of impeller, tendin to ap ly with great force the reactionaryfrce Ao the discharged Water or liquid; the constructionyof thesevolutes,

-10, in theV form of ribs or grooves, I know to be old, and I do notclaim the same broadly, butby the application of the same in' connectionwith the peculiar and novel construction of inside of casing,where thesteel protected circular ribs (4, 4) of same meet the steelprotectedvdisks. of impellerl, forming a runnin ]oint efficient resultsare obtained.

V*W here t e hollow or inclosed type of the t impeller is used,'3distinct chambers are thus formed, the central one between disks ofimpeller, the other two, one on each side of impeller, andwithin thecasing 12. The central kchamber formed by the disks of im- 4 A peller,operates as the dischargeV medium of pump, .and the two outer ones oneach side of the impeller 1, being the field in which the balancingmeanson impeller 1, exert their force. Where the single'impeller is used, asin Fig. 13, two chambers only are formed, as it is believed that thesame will suiiice in this class of pum s, and it is lain that' similarworking con itions will o tain as vwith the Y double or inclosedimpeller.

, ring detacha ly secured to sai ledge of the impeller, in combinationwith a.

k"cutis: M y y 1. In a centrifugal-pump, .an impeller Hav-ing thusdescribed my invention, what VI claim anddesire to secure by LettersPathaving protection on 4the-.discharge edge thereof, said rotectionconsistin of a metal discharge stationary casing having' acircumferential 4rib on the inside of the same, and said rib" havingprotection on its edge, said protection consisting of a metal ringdetachably secured to the edge of the rib for .the p urpose specified.

peller under lateral 2. In a centrifugal pump, the combination of acasing provided with an annular rib on its interior surface, a metalring secured to said annular rib, an impeller mounted to revolve in saidcasing,bearings for the said impeller, a metal ring surrounding the saidimpeller arranged to forma running joint with the ring of the annularrib, and separate means for causing the impeller to run in its central4or normal position in said bearings. j

3. In acentrifugal pump, the combination of' a. casing on its interiorsurface, an-impeller arranged to revolve therein, bearings for theimpeller arranged to permit Vthe impeller to move laterally to allowwater to flow to the back. side thereof to. equalize the pressure on thesaid impeller and cause the same vto run centrally in the casing, andmeans on the back side of .the impeller for increasing the reactionaryeff'ect of the water-thereon.

4. A' centrifugal, turbine or similar pump or motor having an inclosedimpeller mounted to permit sidewise movement of the Aimressure, and withthe side walls of theimpe ler and of the delivery ed and ,arranged toopen the impeller at its periphery to one `of Athe chambers on theopposite. sides of the impeller when the impeller is moved vsidevvisefrom its normal position.

5. In a centrifugal, turbine or similar pump or motor, the combinationwith an inlclosed impeller, of ashaft carrying said sage leading fromthe casing, a lateral y sliding impeller adapted to rotate in the casin'and close communication between the'sai chambers and the deliverypassage, when running in its normal position, but to open communication`therebetween when moved laterally out of said normal position.

7 In a centrifugal pum the combination of a casing, an impelier therein,said casing having chambers formed therein at each side of the impellernear its periphery,

passageways leading from said chambers and merging into thepassagewayfor the jet .of water issuing from the 'impellers, and

means for controlling the said passage-ways so as -to counteract 'theend thrust.

8. In a centrifugal pump, the combination of a casing, an impeller inthe casing,

provided with an annular rib passage surrounding theimpeller construct-1 p said casing havinga chamber formed there- 'in at each side oftheimpeller, said cham bers being in communication with the dis-ycharge'ot` the impeller, and means for overning the pressure in each ofsaid cham ers to counteract the end thrust. p

9. In a centrifugal, turbine, or `similar pump or motor', thecombination with an impeller shaft mounted to move endwise underunbalanced pressure, a casing having .chambers on opposite sides oftheim eller,

of balancing means controlled by sai end- Wise movement to increase theone or the other` of theside cham ers on op# posite sides of theimpeller according to the direction of the endwise movement of shaft.

ressure in the '10. A centrifugal, turbine, or similar pump or motorhaving an inclosed impeller mounted to permit sidewise movement underlateral pressure, a casing having chambers ron opposite sides of theimpeller, and means controlled. by said sidewise movement for varying'the pressures in the chambers on opposite sides of the impeller tobalance the pump.

- In Witnessfwhereof, .I `havel signed my name to this specification inthe presence 'of two subscribing Witnesses.

FERDINAND W. KROGH.

